AST-1025 fix integration tests
This MR fixes the following problems in CI:
- casapy2bbs.py used a non-tuple sequence to index an array. This method is deprecated and raises a warning or error in newer python versions.
- Stokes I only mode in CUDA kernels expand the Stokes I visibilities to XX and YY visibilities, The YY visibilities were incorrectly put at polarization index 1 instead of 3.
- Bump EveryBeam version to 0.4.0, needed by DP3 and wsclean
- Download and install of KernelTuner did not work in combination with an https_proxy. This has been fixed.
There is one remaining test that still fails: tIDGCalDPStep. This due to some recent changes in DP3. This will be fixed as part of AST-1046